The Maths Tip of Today

Do you know the trick of making it easy to figure out what the answer is, when you need to count 9 times *whatever up till 10*? I don’t think my almost 4 year old daughter understands multiplication but she can multiply 9 x 1, 9 x 2…9 x 10 like this:

Use both your hands, and count from the left the number you want to multiply with. Let’s say 4 x 9; lift your left index finger up and then count how many you have many fingers you have left on the left side of the left finger (3) and then count the fingers on the right side of the finger left (6) and arrange the numbers after each other: 36. 

Did you get it? Or was this common knowledge to all? I thought it was pretty cool to see my girl train counting like this!

 

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11 comments

  1. Oh my goodness why did nobody teach me this! Just blew my mind 🙂 .

    1. My kind of maths 🙂

  2. Oh my god! This is so clever! I will certainly teach my kids this trick! Thanks!!

    1. No worries, I was impressed

  3. AWESOME! I never knew this. Here in Japan they have a fantastic way to teach maths. There are kids who can multiply 365 by 849 in their head in a split second. They are like human calculators! 🙂

    1. Wow???!! I’m so happy I still no my multiplication up to 10x but anything more than that…?!!

      1. I know right? Me too! It’s a method involving the “soroban”, which some children take special classes in. I think it’s too late for me, but maybe something my kids can try when they are older.

  4. my kids showed me this years ago! very cool.

    1. I wish I would have too, the drills to learn them by heart the way I had to as a kid was way more boring!

  5. I’ve seen that. I always do it like this. 4×9. one less than 4 is 3. 3 plus 6 equals 9. 36.
    🙂
    But, it’s it awesome when your kids teach you something like that?

    1. That’s cool way to do it too! I just learned the drills as a kid, did you also have to learn them pretty much by heart? I guess that’s why I was so taken when I saw my kid do this.

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